Exploring the Submarine Graham Bank in the Sicily Channel

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Exploring the Submarine Graham Bank in the Sicily Channel ANNALS OF GEOPHYSICS, 59, 2, 2016, S0208; doi:10.4401/ag-6929 Exploring the submarine Graham Bank in the Sicily Channel Mauro Coltelli1,*, Danilo Cavallaro1,2, Giuseppe D’Anna3, Antonino D’Alessandro3, Fausto Grassa4, Giorgio Mangano3, Domenico Patanè1, Stefano Gresta2,5 1 Istituto Nazionale di Geofisica e Vulcanologia, Osservatorio Etneo, Catania, Italy 2 Università di Catania, Dip. di Scienze Biologiche, Geologiche e Ambientali, Sezione di Scienze della Terra, Catania, Italy 3 Istituto Nazionale di Geofisica e Vulcanologia, Centro Nazionale Terremoti, Rome, Italy 4 Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Palermo, Palermo, Italy 5 Istituto Nazionale di Geofisica e Vulcanologia, Rome, Italy Article history Received November 19, 2015; accepted February 19, 2016. Subject classification: Graham Bank, Ferdinandea, Multibeam bathymetry, OBS, ROV, Underwater volcanism. ABSTRACT central portion of the northern margin of the African In the Sicily Channel, volcanic activity has been concentrated mainly on continental plate, called Pelagian Block [Burollet et al. the Pantelleria and Linosa islands, while minor submarine volcanism 1978]. It corresponds to the foreland area of the Sicilian took place in the Adventure, Graham and Nameless banks. The volcanic sector of the Neogene Apenninian-Maghrebian fold-and- activity spanned mostly during Plio-Pleistocene, however, historical sub- thrust belt, the outermost and youngest thrust sheet of marine eruptions occurred in 1831 on the Graham Bank and in 1891 off- which is represented by the Gela Nappe [Ogniben 1969] shore Pantelleria Island. On the Graham Bank, 25 miles SW of Sciacca, (Figure 1). The Sicily Channel consists of a 6-7 km thick the 1831 eruption formed the short-lived Ferdinandea Island that repre- Mesozoic-Cenozoic shallow to deep water carbonate sents the only Italian volcano active in historical times currently almost sedimentary successions, with repeated intercalations completely unknown and not yet monitored. Moreover, most of the Sicily of volcanics [Torelli et al. 1995], covered by Upper Tor- Channel seismicity is concentrated along a broad NS belt extending from tonian-Lower Messinian siliciclastic deposits and Plio- the Graham Bank to Lampedusa Island. In 2012, the Istituto Nazionale Quaternary clastic sequences. di Geofisica e Vulcanologia (INGV) carried out a multidisciplinary The tectonic setting of the Sicily Channel is the oceanographic cruise, named “Ferdinandea 2012”, the preliminary re- product of the Neogene continental collision between sults of which represent the aim of this paper. The cruise goal was the the African and European plates and of the Neogene- mapping of the morpho-structural features of some submarine volcanic Quaternary NW-trending rift [Jongsma et al. 1985, Boc- centres located in the northwestern side of the Sicily Channel and the caletti et al. 1987, Reuther et al. 1993]. temporary recording of their seismic and degassing activity. During the The presence of an intraplate rift in a foreland area, cruise, three OBS/Hs (ocean bottom seismometer with hydrophone) in front of a collisional belt, is not a common tectonic were deployed near the Graham, Nerita and Terribile submarine banks. scenario and the geodynamic mechanism producing During the following 9 months they have recorded several seismo-acoustic the Sicily Channel rift as well as the relationships be- signals produced by both tectonic and volcanic sources. A high-resolution tween tectonics and magmatism in this area have not bathymetric survey was achieved on the Graham Bank and on the sur- yet been completely clarified. The Sicily Channel is con- rounding submarine volcanic centres. A widespread and voluminous gas sidered as a dextral shear zone and its main tectonic bubbles emission was observed by both multibeam sonar echoes and a depressions as large pull-apart basins involving deep ROV (remotely operated vehicle) along the NW side of the Graham Bank, crustal levels [Finetti 1984, Jongsma et al. 1985, Reuther where gas and seafloor samples were also collected. and Eisbacher 1985, Ben-Avraham et al. 1987, Boccaletti et al. 1987, Cello 1987]. A mechanism of intraplate rift 1. Introduction and geodynamic framework of the related to NE-SW directed displacement of Sicily away Sicily Channel from Africa, has been also proposed by Illies [1981]. Within the geodynamic framework of the central Argnani [1990] interpreted the rifting as caused by a lat- Mediterranean area, the Sicily Channel belongs to the eral mantle convection developed during the roll-back S0208 COLTELLI ET AL. Figure 1. Bathymetric map of the Sicily Channel (bathymetry from Gebco - General bathymetric chart of the oceans). The black box dis- plays the study area. The inset shows the structural setting of central Mediterranean Sea (modified from Lentini et al. [2006]): (1) Overthrust of the Sardinian block upon Kabilo-Calabride (KCC) units; (2) Overthrust of the KCC units upon the Apennine-Maghrebian Chain (AMC); (3) External front of AMC upon the foreland units and the external thrust system (ETS); (4) Thrust front of ETS; (5) Main normal and strike- slip faults. PBF: Pelagian block foreland units; QV: Quaternary volcanoes; ME: Malta Escarpment; HP: Hyblean Plateau; GN: Gela Nappe. of the African lithosphere slab beneath the Tyrrhenian nary activity was to achieve, in the medium period, the Basin. Recently, Corti et al. [2006] hypothesize the oc- permanent monitoring of the offshore area integrating currence of two independent tectonic processes in the the data collected by the multidisciplinary sensors de- western side of the Sicily Channel: the NW-SE short- ployed on the seafloor with those recorded by the Isti- ening related to the Sicilian-Maghrebian accretion and tuto Nazionale di Geofisica e Vulcanologia (INGV) a NE-SW extension, acting simultaneously and over- monitoring network installed inland. lapping each other. Most earthquakes of the Sicily Channel are fo- 2. Volcanic and seismic activity cused along a broad NS oriented belt extending from A widespread volcanic activity is known to have Lampedusa Island to southwestern Sicily coast passing occurred in the Sicily Channel during Plio-Pleistocene through the Graham Bank [Cello 1987, Argnani 1990, times [Calanchi et al. 1989] building up Linosa and Pan- Rotolo et al. 2006, Civile et al. 2010, Calò and Parisi 2014] telleria islands where the volcanic products are well ex- (Figure 1). Inside this belt the alkaline volcanic centres of posed. Nevertheless, the oldest magmatic products of Linosa Island, and the Nameless and Graham banks are the Sicily Channel, with an age of 9.5 ± 0.4 Ma, have also located. This belt was interpreted as a strike-slip trans- been found in the Nameless Bank [Beccaluva et al. 1981]. fer fault zone between two segments of the rift system, Geophysical and petrological data revealed the presence Pantelleria Graben to the west and the Malta and Linosa of minor submarine volcanism in the Adventure, Name- grabens to the east [Argnani 1990, Civile et al. 2008]. less, Graham and Terribile banks [Colantoni et al. 1975, This work describes the scientific activity and the Beccaluva et al. 1981, Calanchi et al. 1989, Rotolo et al. preliminary results of the oceanographic cruise named 2006]. The volcanic activity continued until historical “Ferdinandea 2012” carried out offshore southwestern time, testified by the most recent underwater eruptions Sicily. The main objective of the survey was the assess- occurred in 1891, some 4 km NE of Pantelleria Island ment of volcanic and seismic hazard in the area close to [Washington 1909, Conte et al. 2014], and in 1831 on populous Sicilian coast. The final goal of this prelimi- the Graham Bank, producing an ephemeral volcanic is- 2 EXPLORING THE SUBMARINE GRAHAM BANK IN THE SICILY CHANNEL land named Ferdinandea (Figure 2). The 1831 eruption lasted one month and a half, forming, 25 miles SW of Sciacca, the small island of Ferdinandea (300 m large and 60 m high) composed of loose tephra that was eas- ily eroded by wave activity during the next three months [Gemmellaro 1831, Marzolla 1831]. Sicily Channel rift and southwestern Sicily show some different seismo-tectonic behaviours [Meletti et al. 2008]. The strongest earthquakes occurred in 1968 inland Sicily on the Belice Valley (Figure 3), when six events with magnitudes ranging from 5.2 to 6.1 strongly damaged several towns, causing more than three hun- dred casualties [Guidoboni et al. 2007]. Along the SW Sicily coast, the seismicity is characterized by low mag- Figure 2. One of the several paintings by the French painter Edmond nitude seismic events affecting mostly the area of Sci- Joinville showing the 1831 eruption forming Ferdinandea Island. acca [Rigano et al. 1998]. Earthquakes with magnitude not exceeding 5.1 occurred in 1578, 1652, 1724, 1727, The main goals of the cruise were the monitoring of the 1740 and 1817; they were probably located offshore, not potential seismogenic tectonic structures around the far from the coast [Rovida et al. 2011]. Graham, Terrible and Nerita submarine banks, the geo- Since an offshore seismic swarm, with some earth- chemical survey to localize fumarole fields and sample quakes felt along the southern coast of Sicily, occurred gas risings, and the bathymetric mapping of the Graham two weeks before of the 1831 eruption [Falzone et al. Bank and surrounding submarine volcanic centres. Three 2009], a relationship between seismic and volcanic ac- sections of the INGV were involved within the research tivity in the Sicily Channel is suggested. Moreover, activity: (i) Osservatorio Etneo of Catania for the sub- some evidences of ancient earthquakes that damaged marine volcanism and the volcano seismology; (ii) the Greek-Roman town of Selinunte, located on the OBS-Lab of Centro Nazionale Terremoti (National coast 25 km NW of Sciacca, are provided by archaeo- earthquake centre), located at the Gibilmanna obser- logical investigations, which dated two events around vatory near Palermo, for the seismo-acoustic monitoring 400-200 B.C and 400-1200 A.D. [Guidoboni et al. 2002, using three OBS/Hs; (iii) Palermo section for the geo- Bottari et al.
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